Organic acids produced from saatwicken (Visia sativa), acasia (Robinia pseudacasia), alfalfa (Medicago sativa) and white clover (Trifolium repens) on their decomposition, were isolated by microscopical method after Behrens-Kley. Both quality and quantity of organic acids produced differ by the nature of soil used, more from clay soil and less in case of sandy soil. Under the paddy-field condition, at 28-30℃., the amount of acids increased gradually and reaches the maximum after 12 and 8 days with Tamagawa sandy soil and Komaba clay soil respectively, and thence their amount decreases by further decomposition. Acetic, oxalic and lactic acids were isolated from Tamagawa soil, and acetic, butyric, oxalic and latic acids, from Komaba soil. Formic acid, which is often reported by the predecessors in such investigation, was not found but oxalic acid which has not been isolated hitherto, was obtained in this investigation.
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